Lindsay Lohan has cut ties with sobriety circle?

The 27-year-old actress, who completed her sixth stint in rehab last summer, recently moved to London in a bid to get her career on track but has sparked concern she is partying too much.

A source told gossip website RadarOnline.com: "Everyone thinks Lindsay moved to London because she knows that she can get away with things there that she cannot get away with here. She's cut ties with everyone back in the States."

The 'Mean Girls' actress's support networks in New York City and Los Angeles are said to be fed up with her behaviour.

The insider explained: "You can only give someone so many chances. She's not answering phone calls from her sober friends. It's frustrating."

Lindsay, who is set to make her debut in the upcoming West End production 'Speed-The-Plow' later this month, recently insisted her wild partying days are behind her.

She said: "I'm at a place in my life where I like the commitment. I'm looking forward to that part of it."